Ronald Antonio O'Sullivan (born 5 December 1975) is an English professional snooker player who is widely recognised as one of the most talented and accomplished players in the history of the sport. He holds the record for the most ranking titles in professional snooker, with 38. As a six-time world champion, a seven-time Masters champion, and a seven-time UK champion, he has won a record 20 Triple Crown titles, ahead of Stephen Hendry, who won 18. He has been ranked world number one on multiple occasions.

The Triple Crown refers to winning the three most prestigious tournaments in professional snooker: the World Championship, the UK Championship and the invitational Masters.

After an impressive junior career, O'Sullivan turned professional in 1992, aged 16. He won his first ranking title at the 1993 UK Championship aged 17 years and 358 days, making him the youngest player to win a professional ranking event, a record he still holds. He is also the youngest player to win the Masters, which he first achieved in 1995, aged 19 years and 69 days. In 2020, he became the second-oldest player, after Ray Reardon in 1978, to win a world title in snooker's modern era.

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